Re: C64 D64/D81 image creator variant needed

Hi,

christianlott1 schrieb:
On Apr 26, 1:51 am, Wolfgang Moser <wn0...@xxxxxxxxxxxxxx> wrote:
Hi,
Womo

Hey Womo.

Checking Aaron's old post (didn't you realize I would bring this up
again?):
http://groups.google.com/group/comp.sys.cbm/msg/725bfd2535f6c979?dmode=source

so you want to rebuild all the analog-to-digital
parts of a 1541, but a a higher base sample freq.?


I notice he claims to be using the 1541 board but he apparently used
the 1540 for
his explanation.

Ehm you know that early 1541 boards are identical
to the 1540 boards except for the ROM? I mean the
boards the needed the rest circuit patch as
described in a technical manual from Commodore.

Therefore, there is no UH4 pin 7 , it's really UE4
(LM311) pin 7.
Sampling off 1 pin at 16mhz or using a divide by clock counter and
serial shift register at 8mhz.

Just sampling a signal is not enough, if you need
to detect some more analogous effects from the
recording machines. For me the holy grail of
importing Original diskettes is becoming able to
correctly detect the track tail GAP. That is to
reliably identify the position on the track where
writing the record stopped and the R/W head from
the duplicator machine got switched off.

I never tested this with a scope, but I hope to
find useful representations of analogous effects
in these regions.

But if we would be able to sample a track round
with highest precision there are other protections,
Bounty Strikes Back! on disk that uses true half
track protections. You need to precisely measure
out the inter track relations between both half
wise recorded tracks. Don't know, if this will get
solved ever; well timer tricks seem to be good
enough to get it read, but I wouldn't call this
precise.

Jim said he'd use the DOS commands for stepping the motor.

So 1 pin to sample the data, 1 to input and divide the clock?

??? So in general the device remains connected to
the IEC bus, so that standard DOS commands can be
sent to the drive and then you want to additionally
connect it to the serial pulses line?


Weird, this remembers me to similar devices:
1) MegaSofts Shadow
2) Catweasel
3) Disk2FDI

Except for 3) all lack "high-end" software support,
if it comes to imaging disks on a lowest level basis.
Why? And why should software support much less of a
problem with some new hardware?


Womo
.

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